After landing on Mars an astronaut performs simple experiment by dropping rock: A quick calculation using the drop height and the time of fall yields a value of 3.73 m/s^2 for the rock's acceleration. Find the mass of Mars, given that its radius Rm = 3.39 x 10^6 m (Ans: 6.43 x 10^23 kg] (Continued from the previous question) What is the acceleration due to gravity at a distance r = 2RM from the center of Mars? [Ans: 0.933 m/s^2]